期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 212, 期 18, 页码 2998-3006出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.030635
关键词
insect; infection; growth; molting; parasite
类别
资金
- Sigma Xi
- Ellison Medical Foundation
- Korea Research Foundation [KRF-2007-357-C00106]
- National Science Foundation [IOS 0749450]
- US Department of Agriculture National Research Initiative [2005-05382]
- NIH [NIH A103108]
- National Research Foundation of Korea [2007-357-C00106] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0749450] Funding Source: National Science Foundation
Insect pathogens and parasites often affect the growth and development of their hosts, but understanding of these processes is fragmentary. Among the most species-rich and important mortality agents of insects are parasitoid wasps that carry symbiotic polydnaviruses (PDVs). Like many PDV-carrying wasps, Microplitis demolitor inhibits growth and pupation of its lepidopteran host, Pseudoplusia includens, by causing host hemolymph juvenile hormone (JH) titers to remain elevated and preventing ecdysteroid titers from rising. Here we report these alterations only occurred if P. includens was parasitized prior to achieving critical weight, and were fully mimicked by infection with only M. demolitor bracovirus (MdBV). Metabolic assays revealed that MdBV infection of pre-critical weight larvae caused a rapid and persistent state of hyperglycemia and reduced nutrient stores. In vitro ecdysteroid assays further indicated that prothoracic glands from larvae infected prior to achieving critical weight remained in a refractory state of ecdysteroid release, whereas infection of post-critical weight larvae had little or no effect on ecdysteroid release by prothoracic glands. Taken together, our results suggest MdBV causes alterations in metabolic physiology, which prevent the host from achieving critical weight. This in turn inhibits the endocrine events that normally trigger metamorphosis.
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